Key Project Details
HEB Structures for piers and span installation.
Eastbridge for Span manufacture and supply to site.
Project Value$3.0 million
Design work commenced in 2007 and construction was completed in 2008.
The replacement bridge had to have new foundations designed for construction in and around the live rail environment. A maximum of 24 hours was available to demolish the old bridge and complete construction of the 80m new bridge.
|With aging timber piers supporting steel span, Bridge 59 ECMT had reached the end of its service life in 2007 and required urgent replacement to ensure the safe operation of the East Coast Main Trunk Line (ECMT).
Located in a tidal estuary area of Tauranga Harbour area, the bridge spans some 80m across the waterway along a straight section of railway track. The design needed to retain the existing rail alignment and have new abutments constructed immediately in front of the existing abutments, with new piers beneath the existing out in the waterway.
Bored piles utilising driven concrete plugs were founded in suitable material at depth below the softer estuarine material and provided a solid foundation for supporting the new railway spans.
20m long steel plate girder spans were manufactured in Napier and transported to site. During a 24 hour railway line closure over a wet weekend in winter, the old bridge was demolished and new structure successfully commissioned in time for the reopening of the line to continue freight services.